Many of today’s granites contain resins that are very sensitive to UV light. Engineered stone or quartz surfaces also contain the same resins. This product is a UV block that will inhibit these damaging rays from discoloring stone and making it brittle. Granite Sunscreen is simple to apply and will last up to one year before reapplication is necessary. Sold in 4 oz. bottles which are enough to apply to several large countertops.